PLATE X. 



HtALfiA. Fam. Pteropoda. 



rig. . 



1. H. TRisPixosA, Lesueur. — Once taken on floating timber, Dublin. 



Doubtful as British. 



Spirialis, or Peracle. Fum. Pteropoda. 



2. S. FleMiNgii, Forbes. — Fusiis retrovcrsus, Fl. — Zetland, Skye, Ar- 



ran, Donegal, M. C. Snail-shaped. 



3. S. Macandeei, F. mul II. — Near Mizen Head, S. Ire., Kr. Tur- 



reted. 



4. S. Jeffreys!!, F. and H. — Brit. Channel, Er. Discoid. 



Chiton. Sedentary on rocks. 



6. C. FASCicuLAR!s, Linn. — Brit co. generally, Mc. Tufted margin, 



small, granules large. 

 0. C. GRACILIS, Jeffr. Ann. NaL Hist., Jan. 1859. — "Weymouth. 

 Narrow; granules very small; two postero-terminal tufts. 



7. C. DiscREPANs, Brown. — crinitus, Pennant? — Tenby, Guernsey, 



C. Tufted margin, large : granules very small. 



8. C. Hanleyi, Bean. — Scarborough, Skye, W. Ireland, E. Spinose 



margin. 



9. 10. C. MARMOREUS, 0. Fabr. — C. laius, Lowe, C. lavigatm, ruber, 



and picftts. — Scarborough, Porth, Skye, Zetland, W. Ire., R. 

 Margin smooth. 



11. C. L^vis, Pennant. — C. marginatus, Pnlt., C. Acliatina, Brown. 



— Dorset, Devon ; Brit. co. generally, but rare. Dorsally ele- 

 vated; margin reticulated. 



12. C. RUBER, Linn. — Brit, seas generally, Mr. Valves smooth; mar- 



gin coriaceous. 



13. C. ciNEKEUs, Liym. — C. marginatus, Peiin. ? — Brit. co. generally, 



C. Valves carinated ; margin and valves granulated. 



14. C. ALBXJs, Linn. — C. asselloides, Lowe. — Northern coasts, R. Mar- 



ginal granules scaly and large ; dorsal gr. smaller than C. cinereus. 

 1-5, 16. C. ASSELLus, Chemn. — C. minimus, Cinereus albics. — Brit. co. 

 generally, C. Broad, granules on valves beaded. 



17. C. CANCELLATUs, Soioerhj. — C. albns, Pult. — Devon, Guernsey, Isl. 



Man, Oban, Zetland, Loch Carron, Pi. Narrow, back elevated, 

 else like C. assellus. 



Patella. (Limpet.) Sedentary. 



18. P. VULGATA, Linn. — Brit, generally, Cc. Ribs not toothed. 



d 



